american ambassador, christopher stevens. that was two and a half weeks ago. two and a half weeks that have seen the administration first describe this as a spontaneous outburst even though our reporting revealed that officials knew within 24 hours that it was not. only much later did they back away from that assessment. today, the director of national intelligence, james clapper, put out a statement explaining that early evidence supported that theory so that's why they told the white house and congress. clapper says that throughout the investigation, his agency made it clear that the assessment was preliminary and could change. neither his statement nor our sources specify a time frame for the dni's change of view. again, our sources tell us that law enforcement officials knew within 24 hours that this was a terror attack. our reporting also reveals that even though the administration says the investigation is going smoothly, the fbi has hit a bump in the road to the crime scene and tonight, we've got reporting that could explain why that is. a senior law en